They are those little peat disks, add water and they grow into a pellet. They were brand new, same with the tray. The tap water... well... a possible culprit, I guess. I was going by the instructions, add 2.5L water, plant seeds, cover with lid until they germinate... it's not the first mold I've had, but 2-3 is not the same as all 72! Two of the 5 seed packs I used in it were just opened, trailing petunias and sweet peppers, could my seeds be contaminated?
So what now? Can I kill the mold if I uncover them, maybe put them right under the ceiling fan? I'd hate to have lost the trailers, the 12 seeds were the whole pack.